So many lesser-known languages are sadly becoming extinct. My husband's family speaks a tribal language, and there are only about 200-400 speakers left in the world (within the territory). The youth in their community don't care to the know the language, and the elders aren't exactly jumping up holding classes either. Yet there is such criticism that <em>something must be done</em> to save the language! If that's the case, get up and take responsibility because no one else can do it for you.
I am saying this because it seems that there are about ten languages in the world that are mostly spoken by everyone around the world, and we are little by little, losing all of the others.
What happens when our ten or so languages are down to five? At some point, we are going to have more lost languages, and it will be because many people want to learn the languages that are mainly spoken.
So as much as I hate to admit this, with the world becoming a melting-pot online to communicate, then it's quite possible that as we wipe out all these lesser-spoken languages that we will eventually be down to only a few.
We won't see it in our lifetimes, but it just may happen.